1. J. R. Benemann and P. C. Hallenbeck, “Hydrogenases: Their Catalytic Activity, Structure and Function,” ed. by H. G. Schlegel and K. Schneider, Goltze, Göttingen, 1978, p. 395.
2. H. Bothe and G. Eisbrenner, “Hydrogenases: Their Catalytic Activity, Structure and Function,” ed. by H. G. Schlegel and K. Schneider, Goltze, Göttingen, 1978, p. 353.
3. J. R. Benemann and J. C. Weissman, “Microbial Energy Conversion,” ed. by H. G. Schlegel and J. Barnea, Pergamon Press, Oxford, U.K., 1977, p. 413.